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Vulnerabilities

Vulnerability · CVE-2026-6279

The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2.

Published May 21, 2026 · catalog updated Oct 13, 2026 · The Avada Builder (fusion-builder)

Patch now

CVE-2026-6279 is in the CISA known-exploited catalog. Confirm The Avada Builder (fusion-builder) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The Avada Builder (fusion-builder)).
Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
2.39%
Remediation
Remediation guidance
Affected products
stated avada_builder · vendor theme-fusion avada_builder

The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the case in passing attacker-controlled values from a base64-decoded JSON blob directly to without any allowlist validation. This is exploitable by unauthenticated attackers through the AJAX endpoint, which is registered for non-privileged (unauthenticated) users via . The endpoint is protected only by a nonce ( ), but this nonce is generated for user ID 0 and is deterministically exposed in the JavaScript output of any public-facing page containing a Post Cards ( ) or Table of Contents ( ) element. This makes it possible for unauthenticated attackers to execute arbitrary code on affected sites.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • stated avada_builder<= 3.15.2
  • vendor theme-fusion avada_builderversion unspecified

How to fix CVE-2026-6279

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2026-6279 is in the CISA known-exploited catalog. Confirm The Avada Builder (fusion-builder) against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with <= 3.15.2. Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

What should an analyst verify?

CWE-74: Injection. EPSS 2.39%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

WordPress security

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. May 21, 2026 · NIST NVD

    Detected

    The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the case in passing attacker-controlled values from a base64-decoded JSON blob directly to without any allowlist validation. This is exploitable by unauthenticated attackers through the AJAX endpoint, which

  2. Jul 23, 2026 · NIST NVD

    Updated

    The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the case in passing attacker-controlled values from a base64-decoded JSON blob directly to without any allowlist validation. This is exploitable by unauthenticated attackers through the AJAX endpoint, which

  3. Oct 13, 2026 · CISA KEV

    Known exploited

    Apply remediations or mitigations per vendor instructions or discontinue use of the product if remediation or mitigations are unavailable.

  4. Oct 13, 2026 · VulnCheck KEV

    Updated

    The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the case in passing attacker-controlled values from a base64-decoded JSON blob directly to without any allowlist validation. This is exploitable by unauthenticated attackers through the AJAX endpoint, which

Sources

  • CVE.orgVulnerability recordCVE-2026-6279

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-6279

    30-day exploitation probability 2.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-6279

    The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the case in `Fusion_Builder_Conditional_Render_Helper::get_value(

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2026-6279

    The Avada Builder (fusion-builder) plugin for WordPress is vulnerable to Unauthenticated Remote Code Execution via PHP Function Injection in versions up to and including 3.15.2. This is due to the case in passing attacker-controlled values from a base64-decoded JSON blob directly

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.